1. Dept. of Plant Sciences, Fisher Delta Research Center, P.O. Box 160, Portageville, MO 63873, US
2. Dept. of Plant and Soil Sciences, 32 Creelman St., Mississippi State, MS 39762, US
3. Dept. of Chemistry, Mississippi State University, 310 President's Cr., Mississippi State, MS 39762, US
4. Cooperative Extension Service, University of Arkansas, 2001 Hwy 70 E. Lonoke, AR 72086, US
5. Sesaco Corporation, 12304 SW 9th Terr, Yukon, OK 73099 US